Question

　Trees are usefully to us in three important ways:         1. ________

　  they give us wood and another products;                     2. ________

　　they give us shade and they help to stopping droughts and floods. 3. ________

　　However, people in many part of the world                   4. ________

　　have not realized that the third benefit                       5. ________

is the more important. A large number of                     6. ________

　　trees have cut down, but new ones                          7. ________

　　haven't been planted. It is really danger                       8. ________

　　for people. Though we do not try to keep the balance of nature,   9. ________

　　we will lose our live environment.                          10. ________

Answer 1

1. usefully→useful。

　  2. another→other。

3. stopping→stop。

4. part→parts。

5. √

6. more→most。

7. have 后加been。

8. danger→dangerous。

9. Though→If。

10. live→living。

解析:

1.be 后接形容词。

2. another 修饰单数可数名词, other后接复数形式。

3.句中to为不定式符号,而非介词。

4指世界上的许多地方,用复数。

5. √

6.语意有最高级的含义,应用 the most。

7.trees 是cut down的宾语,故用被动式。

8. dangerous 表"危险的",danger为名词。

9.用if引导条件状语从句,表假设。

10.live用作形容词多修饰动物,表示"活的、活生生的",living表"生存、生活",living environment 生存环境。